Download Complications of an intra-arterial injection from an inferior alveolar

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inferior alveolar artery occurred, with
the anesthetic traveling to the internal
maxillary artery, the middle meningeal artery and,
finally, the lacrimal and ophthalmic arteries. Goldenberg6,7 reported a similar case following a mandibular
injection. The patient developed dizziness, diplopia and
partial amaurosis, as well as total blanching of the forehead and upper eyelid ipsilaterally. The author traced
the anesthetic to the lacrimal artery, which affected the
sixth cranial nerve and innervated the lateral rectus
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I
nferior alveolar nerve blocks can cause permanent
alteration in sensation to the lingual nerve, inferior alveolar nerve or both nerves.1,2 In addition
to altered nerve sensation, permanent loss of
vision has been reported in one case.3 Occulomotor
disturbances can occur with local anesthetic injections.
Rood4 reported a case in which 1.5
milliliters of lidocaine with 1:80,000
Dentists should epinephrine was injected in an inferior
diagnose and alveolar nerve block. Immediate loss of
treat the vision developed in the ipsilateral eye,
along with upper-eyelid ptosis and
problems
medial strabismus, which resulted in
arising from double vision. The patient also developed
intra-arterial ischemia of the palatal mucosa. Within
injections five to 45 minutes, all symptoms
appropriately disappeared.
Blaxter and Britten5 reported several
to avoid any
cases involving transient loss of vision,
irreversible
diplopia and amaurosis. They postulated
complications. that an intra-arterial injection of the
T
BRIAN WEBBER, D.D.S.; HERBERT ORLANSKY,
D.D.S.; CHARLES LIPTON, D.M.D.;
MARK STEVENS, D.D.S.
CON
Complications of an
intra-arterial injection
from an inferior
alveolar nerve block
Background. Unintended intravascular
injections from inferior alveolar nerve
blocks result in frustrating complications,
A D A
both systemically and locally. It Jis impera✷
✷
tive that the dentist diagnose the complica-
tion and treat it appropriately. Sometimes,
several reactions occur simultaneously.
N
C
U
Case Description. The authors
A U I Npresent
D
1
RT G E
a case report that illustrates some ofI C
the
LE
many complications resulting from inferior
alveolar nerve block injections. In this case,
complications developed from intra-arterial
injection of local anesthetic. The facial skin,
intraoral structures and eye were affected.
Within 60 minutes of the injection, all
structures returned to their normal state.
Prompt diagnosis and reassurance usually
calm the patient.
Clinical Implications. Even when clinicians use the utmost care, by aspirating
before the injection and noting anatomical
landmarks, intra-arterial injections can
occur during inferior alveolar nerve blocks.
Fortunately, permanent damage to nerves,
facial and oral tissues, and eyes is rare. The
practitioner should diagnose and treat the
problems appropriately to avoid any
irreversible complications.
IO
N
CASE REPORT
ABSTRACT
T
P R A C T I C E
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C L I N I C A L
muscle. This muscle became anesthetized for
about 20 minutes.
Dryden8 reported a case following a GowGates block injection. He used 2 percent
lidocaine with epinephrine 1:100,000 after
no material was aspirated. After a second
injection, which was administered within
30 seconds of the first injection, the patient
felt a burning sensation around the right eye
and infraorbital region. Diplopia and ptosis
of the right eye developed, as well as blanching of the skin coinciding with the infraorbital artery. In addition, the patient experienced blanching on the right side of the
hard palate that followed the distribution of
the greater palatine artery.
CASE REPORT
A 33-year-old woman was referred to one of
us (B.W.) for endodontic treatment of the
JADA, Vol. 132, December 2001
Copyright ©1998-2001 American Dental Association. All rights reserved.
C L I N I C A L
lower left first molar. Her general dentist (H.O.)
had administered a traditional left mandibular
block injection with 2 percent lidocaine and
epinephrine 1:100,000. Within one minute, the
patient felt dizzy and light-headed. The examination revealed that the left infraorbital region had
turned white. This blanching extended to the left
side of the nose, the lower eyelid and the lip. The
upper eyelid and supraorbital region also were
affected, although the skin was not blanched.
Signs of numbness. Overall, the patient
reported feeling as if the entire left side of her
head and face had become numb. Intraorally, the
lower left lip had clinical signs of numbness.
Vision was slightly blurred and there were no
signs of strabismus, but the periorbital area was
numb (Figure).
The patient was apprehensive and began to
panic. She did not understand what was happening. After the examination and being reassured,
the patient calmed down.
Intra-arterial injection of anesthetic.
According to Malamed,9 the most frequently
observed emergencies in the dental office are syncope, allergy, angina pectoris, postural hypotension, seizures, acute asthma, hyperventilation,
epinephrine reaction and hypoglycemia. After
ruling out all of the above, we determined that
the patient was responding to an intra-arterial
injection of anesthetic. She was alert and conscious, did not break out in an allergic rash, did
not have shortness of breath or chest pains, and
was breathing normally, although faster. The
patient had no medical history of diabetes or any
other systemic diseases.
Clinicians need to keep in mind the basic lifesupport measures: position, airway, breathing,
circulation and definitive care (that is, PABCD).9
In particular, they need to observe the patient’s
breathing and circulation (look for blanching).
After about 20 minutes, our patient felt calmer
and began to feel the effects of the anesthetic
subsiding on her external facial areas. She
elected to proceed with the endodontic procedure
since she was well-anesthetized, but requested a
one-visit procedure to avoid a similar experience.
Within 45 minutes of the injection, the blanching
of the infraorbital region had dissipated. No
diplopia or ocular changes remained. Numbness
of the supraorbital and infraorbital regions and
nose was completely gone. After about four
hours, the effects of the local anesthetic on the
inferior alveolar nerve had worn off.
P R A C T I C E
Figure. The arrow points to the blanched skin, indicating
vasoconstriction of the peripheral branches of the infraorbital artery.
DISCUSSION
The blood supply to the head and face is via the
external carotid artery, which branches off to
form the internal maxillary artery. Further
branching forms the infraorbital artery to the
skin of the orbital area and the greater palatine
artery to the roof of the mouth. The middle
meningeal artery branches off the internal maxillary artery and forms branches that anastomose
with the ophthalmic and lacrimal arteries. The
inferior alveolar artery branches off the internal
maxillary artery and descends to the mandibular
foramen.
Injection of the local anesthetic into the inferior alveolar artery traversing the aforementioned arterial branches would account for the
deviation of the eye, with temporary anesthesia of
the lateral rectus muscle. The epinephrine works
peripherally on the α-adrenergic receptors of the
skin and mucosa, resulting in constriction of the
blood vessels. This would account for the blanching of the skin localized to the infraorbital foramen area, resulting from decreased blood flow.
Epinephrine is a vasopressor that works by stimulating both α- and β-adrenergic receptors. It
increases blood pressure by stimulating the cardiac β1 receptors of the myocardium, which
increases its ventricular contraction strength
and the heart rate, as well as by peripheral
vasoconstriction.
JADA, Vol. 132, December 2001
Copyright ©1998-2001 American Dental Association. All rights reserved.
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C L I N I C A L
P R A C T I C E
CONCLUSION
The most important steps in managing a reaction
to an intra-arterial injection of local anesthetic
are to promptly diagnose the problem and reassure the patient. If other symptoms occur, such as
syncope or heart palpitations, clinicians should
initiate additional appropriate treatment. It is
essential that the dentist explain to the patient
what is happening and reassure him or her that
the extended anesthesia is temporary. It also may
be necessary to have someone accompany the
patient home if his or her sight is not completely
restored by the end of the procedure. Follow-up
telephone calls and possibly an examination by
an ophthalmologist may be necessary for medicolegal reasons and to demonstrate concern for
the patient. ■
Dr. Orlansky is in private practice in general dentistry, New York.
Dr. Lipton is in private practice in general dentistry, New York.
Dr. Stevens is in private practice in periodontics, New York.
1. Harn SD, Durham TM. Incidence of lingual nerve trauma and
postinjection complications in conventional mandibular block anesthesia. JADA 1990;121:519-23.
2. Pogrel MA, Bryan J, Regezi J. Nerve damage associated with
inferior alveolar nerve blocks. JADA 1995;126:1150-5.
3. Walsh F, Hoyt W. Clinical neuro-ophthalmology. 3rd ed. Baltimore:
Williams & Wilkins; 1969:2501-2.
4. Rood J. Ocular complication of inferior dental nerve block. Br Dent
J 1972;132:23-4.
5. Blaxter P, Britten M. Transient amaurosis after mandibular nerve
block. Br Med J 1967;1:681.
6. Goldenberg A. Transient diplopia from a posterior alveolar injection. J Endod 1990;16:550-1.
7. Goldenberg A. Diplopia resulting from a mandibular injection. J
Endod 1983;9:261-2.
8. Dryden J. An unusual complication resulting from a Gow-Gates
mandibular block. Compendium 1993;14(1):94-8.
9. Malamed S. Emergency medicine: preparation and basics of management. Dent Today 2001;20(6):64-7.
Dr. Webber is in private practice in endodontics, 40 Hemlock Lane,
Roslyn Heights, N.Y. 11577. Address reprint requests to Dr. Webber.
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JADA, Vol. 132, December 2001
Copyright ©1998-2001 American Dental Association. All rights reserved.